German HALO research aircraft to investigate ozone hole, Amazon fires and gravity waves
by Staff Writers
Munich, Germany (SPX) Sep 12, 2019
The German High Altitude and Long Range (HALO) research aircraft will be exploring the atmosphere in the southern hemisphere and its impact on climate change during September and November 2019 as part of the SOUTHTRAC (Transport and Composition of the Southern Hemisphere UTLS) mission. The main objective of the first phase of the campaign is to investigate gravity waves at the southern tip of South America and over Antarctica.
In the second phase of the campaign, in November, the scientific focus of the investigations will shift to the exchange of air masses between the stratosphere and troposphere. During the transfer flights between Europe and South America, the researchers will investigate how current burning of biomass in the Amazon rainforest is affecting the climate, among other things. Scientists from the German Aerospace Center (Deutsches Zentrum fur Luft- und Raumfahrt; DLR), the Karlsruhe Institute of Technology (KIT), Forschungszentrum Julich (FZJ) and the universities of Mainz and Frankfurt will coordinate the extensive research flights.
Trace gases, such as ozone and water vapour, are effective greenhouse gases and play an important role in climate change. Since the late 1980s the Montreal Protocol has restricted the manufacture of substances such as hydrochlorofluorocarbons, which severely deplete the ozone layer.
A very large hole has formed in the ozone layer over the Antarctic region. It will take many decades for the ozone layer to fully recover. The importance of this for climate change in the southern hemisphere is now being investigated in detail by researchers as part of the SOUTHTRAC campaign.
The most important atmospheric conditions for the formation of the ozone hole over Antarctica are low temperatures and the reduced exchange of air masses with mid-latitudes. The latter is ensured by a stable Antarctic polar air vortex, but this can be weakened by strong wave activity.
"For the first time in this region, we are investigating the excitation and propagation of gravity waves into the middle atmosphere at an altitude of 90 kilometres, which is partly triggered by the airflow over the Andes and the Antarctic peninsula. These slow down the polar vortex," says Markus Rapp, Director of the DLR Institute of Atmospheric Physics. "Until now, this effect has not been sufficiently taken into account in climate and weather models."
"During the measurement flights, we also want to examine the chemical and dynamic processes that influence trace gases like ozone and water vapour in the tropopause region," says Bjorn-Martin Sinnhuber of the Institute of Meteorology and Climate Research - Atmospheric Trace Gases and Remote Sensing at KIT.
"We will also look at the role played by biomass combustion of the kind that is currently occurring with the fires in the Amazon rainforest." The universities of Wuppertal and Heidelberg are also partners in the project.
Innovative remote sensing techniques will be combined with highly accurate local measurements on the aircraft and compared with satellite data. "In order to adapt the flights optimally to the meteorological situation, atmospheric modellers will be on site, using predictions made by the Julich atmosphere model CLaMS (Chemical Long-Range Model of the Stratosphere)," says Martin Riese, Deputy Director of the Institute of Energy and Climate Research at FZJ.
The long-range airborne measurements conducted using HALO will be supplemented by activities conducted on the ground. Balloon radiosondes will be launched, and measurements will be performed on board a glider operating from the city of El Calafate. Meteorological and chemical forecasting models will provide the information about the local weather, atmospheric circulation and trace gas distribution required for precise flight planning.
Airborne laser looking upwards
"For the first time, HALO is using the Airborne LIdar for Middle Atmosphere research (ALIMA) to explore altitudes between 15 and 90 kilometres. This is the region where gravity waves influence the global circulation system, and has not yet been given adequate consideration in climate models," says Bernd Kaifler, who, together with his colleagues at the DLR Institute of Atmospheric Physics, was responsible for the development and construction of the unique new instrument.
The spectral measurement and evaluation of the laser light backscattered in the atmosphere and collected by a telescope on board HALO provides the researchers with high-resolution temperature, wind and aerosol profiles along the flight path, and therein the signatures of the gravity waves.
Oceans, mountains, gravity waves
Night shifts for research
"Flights to Antarctica, in particular, where there is no air traffic control and no alternative airfields, have to be very carefully planned if they are to return safely to their starting point in Rio Grande, Argentina." HALO was flown here in three stages from its home base at the DLR site in Oberpfaffenhofen, near Munich. It first travelled to the Cape Verde Islands and then onward to Buenos Aires.
Researchers show satellite data can reveal fire susceptibility in peatlands
Stanford CA (SPX) Sep 10, 2019
When large areas of carbon-rich soil catch fire, the blaze emits massive amounts of carbon into the atmosphere and creates a thick haze some residents of Southeast Asia know all too well. In 2015, the haze from peatland fires was fatal, responsible for more than 100,000 premature deaths in Indonesia, Malaysia and Singapore. Because of how they accumulate organic material for long periods of time, undisturbed peatlands are considered one of the most effective natural ecosystems for carbon storage. ... read more
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